P6 Math: Fraction of Remainder with Addition and Ratio at the End

Fraction of remainder questions will be more complex at P6 level.

The following question type adds on to the difficulty by including an addition and provides the ratio comparing between the total at first and the total at the end.

Such questions usually appear in Paper 2.
Calculator usage is allowed.

Devinder has some money at first.
He spent 3/8 of this money to buy a ruler and
2/7 of the remaining money on a book.
After he was given $9.20 by his uncle, the ratio of his
money at the end to his total amount of money at first became 5:2.

How much did Devinder spend on his ruler?



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